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AIRCRAFT
RECEIVER KIT
Ramsey Electronics Model No.
A new and improved version of our popular Aircraft Receiver kit,
this new model features an LCD display, scan function, and
increased sensitivity, all in a rugged metal enclosure. Rivals
professional units costing much more!
•
Tunes the entire 118 - 136 MHz Air band
•
Operates on 12 to 15 VDC
•
Scan function "finds" the signals for you; no more laborious
tuning to find a transmission
•
Memory locations make it easy to refind your local favorites
•
Listen to control towers, centers, and planes en-route
•
Very sensitive; picks up planes 100 miles away!
•
Great project for all pilots and flight students
•
Clear, concise step-by-step instructions carefully guide you to a
finished kit that not only works - but you'll learn too!
AR2WT
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Summary of Contents for Ramsey Electronics AR2WT
- Page 1 AIRCRAFT RECEIVER KIT Ramsey Electronics Model No. AR2WT A new and improved version of our popular Aircraft Receiver kit, this new model features an LCD display, scan function, and increased sensitivity, all in a rugged metal enclosure. Rivals professional units costing much more! •...
- Page 2 2004 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America. AR2 • 2...
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Page 3: Table Of Contents
Ramsey Publication No. AR2 Manual Price Only $5.00 INSTRUCTION MANUAL FOR AIRCRAFT RECEIVER TABLE OF CONTENTS Introduction .......... 4 What You Can Expect to Hear .... 4 Circuit Description........ 8 Block Diagram ........10 AR2 Schematic Centerfold ....12 Antenna Considerations ....16 Modes of Operation ...... -
Page 4: Introduction
INTRODUCTION TO THE AR2 AVIATION RECEIVER KIT The Ramsey AR2 Aviation Receiver is a new design of our original Ramsey AR1 Aircraft Receiver. The AR1 has been built and loved for years by hobbyists with an interest in both aviation and electronics. The AR2 design takes the best of the AR1 and adds scanning functions, and a slick metal case for superior noise reduction. - Page 5 ATIS – Automated Terminal Information System ATIS, is a repeated broadcast about basic weather information, runways in use, and any special information such as closed taxiways or runways. ASOS/AWOS – Automated Surface Observing System/Automated Weather Observing System This system is similar to ATIS but usually located at un-towered airports. Approach Control &...
- Page 6 routed via computers to the proper company, relieving some of the necessity for routine voice communication. With ACARS, routine items such as departure reports, arrival reports, passenger loads, fuel data, engine performance data, and more can be retrieved from the aircraft at automatic intervals.
- Page 7 AR2 • 7...
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Page 8: Circuit Description
CIRCUIT DESCRIPTION Radio Basics: We’ll take the circuit section by section; the letters show which part of the block diagram we’re explaining in each section. The AR2 is a simple super-heterodyne receiver. A heterodyne receiver is a receiver that first converts the desired received frequency into an IF frequency, or Intermediate Frequency. - Page 9 have to be set at 118.300 MHz + 10.700 MHz or 129.000MHz. It would then be sent to the mixer and on the output there would be 129.000MHz (LO), 118.3MHz(Fr), 247.3MHz(Sum) and 10.700MHz (IF). (See Figure 1) After the mixer we use a narrow-band filter (E) to reject everything but the 10.7MHz IF signal output from the mixer.
- Page 10 AR2 • 10...
- Page 11 AM + 450kHz Detector + Audio Out Since the AR2 is a relatively complex (and educational!) product, it’s easiest to show you how things work by using a block diagram and explaining the different sections. This is a simplified block diagram, but is suitable for our needs.
- Page 12 AR2 • 12...
- Page 13 AR2 • 13...
- Page 14 Block G. This is the main detector, AGC, 2nd LO, reference oscillator, and filtering all wrapped into one part. Block H. 2nd IF filtering. This section is for further attenuating adjacent signals. The goal is to reduce signals 25kHz away more than 90dB, or the range of the AGC of the detector component.
- Page 15 being “imposed” on the VCO. It also provides some amplification to give the VCO 0-12V of tuning from a 5V PLL part. Block K. The microcontroller is the “brains” of the entire project. This device programs the PLL to get the frequencies desired, handles the jog dial by interpreting it’s pulses, and then writes the data to the displays.
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Page 16: Antenna Considerations
ANTENNA CONSIDERATIONS An antenna for your AR1C can be as simple as a 21" piece of wire or a fancy roof-mounted aviation antenna. Most folks near an airport will get plenty of in- the-air action from the wire, but if you're more than a few miles away, a decent roof-mount job is the way to go. -
Page 17: Modes Of Operation
MODES OF OPERATION: The AR2 uses an advanced way to access the many useful features built in to the unit. What looks like a volume control at first glance is actually a jog dial. No, it doesn’t go for a jog at the end of a long work day, instead it allows you to enter values digitally in a convenient way. - Page 18 automatically skip to the next frequency after a specified time. 10. Skip Scanner 2 Mode. This mode allows you to scan up to 20 frequencies saved in the Scanner 2 Setup mode, only this will automatically skip to the next frequency after a specified time. 11.
- Page 19 Skipping to the next channel will occur after timeout in skip mode only. Standard Scanner Modes 1-4 and skip modes: Use the jog dial to select a frequency other than what is currently running. Press and release the jog dial to skip to the next active memory Press and hold the jog dial to prevent stopping at this frequency for the duration of the selection of this mode.
- Page 20 “user friendly” format possible. We value your opinions, comments, and additions you’d like to see in future publications. Please submit comments or ideas to: Ramsey Electronics Inc. or email us at techsupport@ramseymail.com Attn. Hobby Kit Department...
- Page 21 These pages intentionally left blank. AR2 • 21...
- Page 22 AR2 • 22...
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Page 23: Warranty
'1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase. - Page 24 TABLE OF CONTENTS Introduction.......... 4 What You Can Expect to Hear .... 4 Circuit Description ....... 8 Block Diagram ........10 AR2 Schematic Centerfold....12 Antenna Considerations....16 Modes of Operation......17 Warranty..........35 Manual Price Only: $5.00 Ramsey Publication No. AR2 Assembly and Instruction manual for: RAMSEY MODEL NO.
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